- Phản ứng : \[\underset{0,15\,mol}{\mathop{HCOO-C{{H}_{2}}-COOC{{H}_{3}}}}\,+~\underset{0,4\,mol}{\mathop{NaOH}}\,\xrightarrow{{{t}^{0}}}\text{ }HCOONa\text{ }+\text{ }HO-C{{H}_{2}}-COONa\text{ }+\text{ }\underset{0,15\,mol}{\mathop{C{{H}_{3}}OH}}\,\]

\[\xrightarrow{BTKL}{{m}_{\text{r }\!\!{\scriptscriptstyle 3\!/\!{ }_4}\!\!\text{ n khan}}}={{m}_{X}}+40{{n}_{NaOH}}-32{{n}_{C{{H}_{3}}OH}}=28,9\,(g)\]